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Local mesh

Local mesh link types

7-5

Operational modes

Three different roles can be assigned to a local mesh node: Master, Alternate Master, or

Slave. Each role governs how upstream and downstream links are established by the node.

 Master: Root node that provides the upstream link to the ground network that the other

nodes want to reach. The master never tries to connect to any other node. It waits for

links from downstream alternate master or slave nodes.

Note: It is possible to have several masters for the same mesh ID connected to the

ground network. This can be used to provide redundant paths to the ground

network for downstream nodes.

 Alternate Master: First establishes an upstream link with a master or alternate master

node. Next, operates as a master node waits for links from downstream alternate master

or slave nodes.

 Slave: Can only establish an upstream link with master or alternate master node. Slave

nodes cannot establish downstream links with other nodes.

Node discovery

Discovery of another node to link with is limited to nodes with the same mesh ID. The link is

established with the node that has the best score based on the following calculation:

Score = SNR - (Number of hops x SNR cost of each hop)

If a node looses its upstream link, it automatically discovers and connects to another

available node.

Alternate master

node

A node that is configured in Alternate master mode, which enables it

to make upstream and downstream connections.

Slave node A node that is configured in Slave mode, which enables it to make

upstream connections only.

Root network Wired network to which the root node is connected. This is the

network to which the local mesh provides access for all connected

alternate master and slave nodes.

Mesh A series of nodes that connect to form a network. Each mesh is

identified by a unique mesh ID.

Link The wireless connection between two nodes.

Downstream link A link that transports data away from the root network.

Upstream link A link that transports data towards the root network.

Peer Any two connected nodes are peers. In the diagram, AP 1 is the peer of

both AP 2 and AP 3.

Term Definition

HP MSM3xx User Manual

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